我在从 SpringBoot 2.4.5 升级到 2.5.0 时遇到了一些问题。该项目是一个Kotlin项目，同样使用13.0.0版本的Keycloak作为IDM。
错误发生在应用程序启动和测试时。异常ConfigServletWebServerApplicationContext与消息一起抛出Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springSecurityFilterChain' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw exception; nested exception is java.lang.NullPointerException
您还可以在以下内容中检查SecurityConfig.kt,SecurityConfigTest.kt和两个堆栈跟踪（应用程序和测试的正常启动）：
安全配置文件
import org.keycloak.adapters.springsecurity.KeycloakConfiguration
import org.keycloak.adapters.springsecurity.config.KeycloakWebSecurityConfigurerAdapter
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.context.annotation.Bean
import org.springframework.http.HttpStatus
import org.springframework.security.access.prepost.PreAuthorize
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity
import org.springframework.security.config.annotation.web.builders.HttpSecurity
import org.springframework.security.core.authority.mapping.SimpleAuthorityMapper …